Hi To ALL:
I am using the following system:
1769-L31 Compact Logic Processor
1769-IQ16
1769-OB16
1769-IF8
1769-IF8
1769-IF8
1769-IF8
1769-OF8C
MVI69-MCM
History
The whole Assembly is mounted on DIN rail. The power is 220 V AC(50 Hz) which is fed into rectifiers (convert 220 into 24v DC).
We powered up the panel, and after some time the whole PLC system along with I/O cards went down, there was no power in the whole system. But there was a power in the HMI screen and stuff. I metered the power; we are getting the 220 VAC at one side of the rectifiers and 24v DC at the other side of rectifiers. After tracing the power, I check the power in the PLC power supply terminals, and surprisingly there was the power even on the power supply terminal, checked the fuses (on the power supply and in the panels). Everything was OK
Further to my testing, I took out the whole PLC rack along with I/O cards and try to put a separate 24v DC power supply. After supplying this, the following things were observed:
As soon as the power is applied, the processor’s OK LED blinks red for a fraction of a second and again the whole rack went off. Even after excessive tries, it won’t power up.
After this, I took out the processor from the rack, and the let the power supply off (un-screw the terminal) for some time and put the power back on, this time it powers up, but the three Analog input cards were not powered up. So I thought it might be the analog cards creating problems, so I took all three analog input cards from the rack and put the processor back on and power the system up, but this time it did the same thing, processor’s LED blinks red for a fraction of second and then whole system shuts down. At this point even taking the processor out and try powering the system up, will not help, As I have to un-screw the power terminals of the battery and let be stand alone for a few minutes and then screw the terminal again and power cycle it, then it works fine.
I have no idea where the problem is, it might be a processor problem…… It might be the Analog cards…..but what caused it have no idea…..May be the power surge inside the panel, made the the whole system malfunction , or specifically the processor. I would just like to bring this incident up to air so that if any of you guys experienced the same thing, can share his ideas and suggestion, what can be done to prevent it in future….or how can I do more testing to make sure what is being damaged. Any ideas or suggestion on HOW IT HAPPENED< REASONS, AND SOLUTIONS will be appreciated. Thanks in advance.
I am using the following system:
1769-L31 Compact Logic Processor
1769-IQ16
1769-OB16
1769-IF8
1769-IF8
1769-IF8
1769-IF8
1769-OF8C
MVI69-MCM
History
The whole Assembly is mounted on DIN rail. The power is 220 V AC(50 Hz) which is fed into rectifiers (convert 220 into 24v DC).
We powered up the panel, and after some time the whole PLC system along with I/O cards went down, there was no power in the whole system. But there was a power in the HMI screen and stuff. I metered the power; we are getting the 220 VAC at one side of the rectifiers and 24v DC at the other side of rectifiers. After tracing the power, I check the power in the PLC power supply terminals, and surprisingly there was the power even on the power supply terminal, checked the fuses (on the power supply and in the panels). Everything was OK
Further to my testing, I took out the whole PLC rack along with I/O cards and try to put a separate 24v DC power supply. After supplying this, the following things were observed:
As soon as the power is applied, the processor’s OK LED blinks red for a fraction of a second and again the whole rack went off. Even after excessive tries, it won’t power up.
After this, I took out the processor from the rack, and the let the power supply off (un-screw the terminal) for some time and put the power back on, this time it powers up, but the three Analog input cards were not powered up. So I thought it might be the analog cards creating problems, so I took all three analog input cards from the rack and put the processor back on and power the system up, but this time it did the same thing, processor’s LED blinks red for a fraction of second and then whole system shuts down. At this point even taking the processor out and try powering the system up, will not help, As I have to un-screw the power terminals of the battery and let be stand alone for a few minutes and then screw the terminal again and power cycle it, then it works fine.
I have no idea where the problem is, it might be a processor problem…… It might be the Analog cards…..but what caused it have no idea…..May be the power surge inside the panel, made the the whole system malfunction , or specifically the processor. I would just like to bring this incident up to air so that if any of you guys experienced the same thing, can share his ideas and suggestion, what can be done to prevent it in future….or how can I do more testing to make sure what is being damaged. Any ideas or suggestion on HOW IT HAPPENED< REASONS, AND SOLUTIONS will be appreciated. Thanks in advance.